Họ nguyên hàm của hàm số  f x = tan   x  là

A.  ln   cos   x + C

B.  1 cos 2   x + C

C.  - ln   cos   x + C

D.  - 1 cos 2   x + C

The loving-peace people have been working for the ......................... of World Peace.

A. access

B. glory

C. success

D. promotion

There is a special fund for the severely ....................... 

A. orphan

B. volunteer

C. aged

D. handicapped

Phương trình  sin x − π 3 = 1  có nghiệm là:

A.  x = 5 π 6 + k 2 π .

B.  x = π 3 + k 2 π .

C.  x = π 3 + k π .

D.  x = 5 π 6 + k π .

Mark the letter A, B, C, or D to indicate the word or phrase CLOSEST in meaning to the bold and underlined part in each of the following questions.

I told you clearly and definitely not to write your answers in pencil, Smith!

A. altogether

B. specifically

C. thoroughly

D. considerably